Android Question Get html code from webview JavaScript

Sub Globals     
   Private WebView1 As WebView
   Dim WebViewExtras1 As WebViewExtras  
   Dim WebChromeClient1 As DefaultWebChromeClient
   Dim JavascriptInterface1 As DefaultJavascriptInterface
End Sub

   WebView1.JavaScriptEnabled = True      
   WebViewExtras1.Initialize(WebView1)
   WebViewExtras1.JavaScriptEnabled = True      
   JavascriptInterface1.Initialize      
   WebViewExtras1.addJavascriptInterface(JavascriptInterface1, "B4A")
   WebChromeClient1.Initialize("WebChromeClient1")
   WebViewExtras1.SetWebChromeClient(WebChromeClient1)   
   WebView1.LoadUrl("https://www.google.es/maps")

Sub WebView1_PageFinished (Url As String)  
   Dim Javascript As String
   Javascript = "B4A.CallSub('ProcessHTML', false, document.documentElement.outerHTML)"
   WebViewExtras1.executeJavascript(Javascript)  
End Sub

Sub ProcessHTML(Html As String)
  File.WriteString(File.DirRootExternal,"sample.html",Html)
End Sub

The old way:

WebViewExtras1.executeJavascript(webview1, Javascript)

The new way:

WebViewExtras1.executeJavascript(Javascript)

Javascript = "B4A.CallSub('ProcessHTML', false, document.body.innerHTML)"